THE CAMBRIDGE NATURAL HISTORY Edited by Sir S. P. HABMER, K.B.E., Sc.D., P.E.S., and A. E. SHIPLEY, G-.B.E., M.A., F.R.S. In Ten Volumes. Fully Illustrated. Medium 8vo. 21s. net each. FIELD.—" The Cambridge Natural History series of volumes is one of very great value to all students of biological science. The books are not intended for popular reading, but for utilisation by those who are desirous of making themselves thoroughly acquainted with the branches of zoology of which they treat.3' VOLUME I. Protozoa, by MARCUS HALRTOQ-, M.A., D.Sc. ; Porifera (Sponges), by IGEBNA B. J. SOL LAS, B.Sc.; Coelenterata and Otenophora, by S. J. HICKSON, M.A., F.R.S. i Echinodermata, by E. W. MACBBIDE, M.A, F.R.S. FIELD,—" The book can be in the strongest manner recommended to those for whose benefit it has been written. We know of no work from which a more truly scientific account of the Protozoa, Echinodermata, and other lower forms of animal life could be gained," VOLUME II. Flatworms and Mesozoa, by E. W. GAMBLE, B.Sc.; Nemertines, by Miss L. SHELDON ; Threadworms and Sagitta, by Sir A. E. SHIPLEY, Q.B.E., M.A., F.R.S. ; Botifers, by MARCUS HARTOG, M.A., D.Sc.; Polychaet Worms, by W. BLAXLAND BENHAM, B.Sc., M.A. ; Earthworms and Leeches, by F. E. BEDDABD, M.A., F.R.S. ; Gepliyrea and Pnorozds, by Sir A. E. SHIPLEY, G.B.E., M.A., F.B.S. ; Polyzoa, by Sir S. F. HABMEE, K.B.E., Sc.B.s F.R.S. GAMBRIDGE REVIEW.—"Most of the articles are of a Tery high order of merit—taken;* as a whole, it may be said that they are by far the best which have as yet been puhlished. . . . We may say with confidence that the same amount of information, within the same compass, is to he had In no other zoological work." VOLUME III. Molluscs, by the Rev. A. H. COOKB, M.A.; BracMopods (Recent), by Sir A. E. SHIPLEY, M.A., F.R.S. ; EiocMopods (Fossil), by F. R. C. REED, M.A. TIMES.—*' There are very many, not only among educated people who take an the latest results of scientific research. Altogether, to judge from this first volume, tha Cambridge Natural History promises to fulfil all the expectations that its prospectus holds ont." VOLUME IV. Crustacea, by GEOFFREY W. SMITH, M.A., and the late W. F. R. WEM>ON, M.A. ; TriloMtes, by HENRY WOODS, M.A, ; Introduction to Arachnida, and King-Grabs, by Sir A. E. SHIPLEY, G.B.E., M.A., F.B.S.; Eurypterida, by HKNRY WOODS, M.A. ; Scorpions, Spiders, Mites, Ticks, etc., by OBOIL WARBUKTOK, M.A. ; Tardigrade (Water-Bears), by Sir A. E. SHIPLEY, 0.B.E., M.A., P.R.S. ; Pentastomida, by Sir A. E. SHIPLEY, G.B.E., M.A., F.K.S. ; Pycnogonida, by D'AacY W. THOMPSON, C.R, M.A.